12001533 has 4 divisors (see below), whose sum is σ = 16002048. Its totient is φ = 8001020.

The previous prime is 12001523. The next prime is 12001537. The reversal of 12001533 is 33510021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12001533 - 2⁹ = 12001021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000253 + ... + 2000258.

It is an arithmetic number, because the mean of its divisors is an integer number (4000512).

Almost surely, 2^12001533 is an apocalyptic number.

It is an amenable number.

12001533 is a deficient number, since it is larger than the sum of its proper divisors (4000515).

12001533 is an equidigital number, since it uses as much as digits as its factorization.

12001533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000514.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 12001533 is about 3464.3228775621. The cubic root of 12001533 is about 228.9525972452.

Adding to 12001533 its reverse (33510021), we get a palindrome (45511554).

The spelling of 12001533 in words is "twelve million, one thousand, five hundred thirty-three".